Comment by Digory
If you can handle putting the nozzle on your garden hose, you should be able to handle it.
In the US, the water pipe almost always connects to the toilet through a small shutoff valve. After the valve, it connects to the toilet through a "supply." The supply is basically a short garden hose, with screw-on connections at both ends.
Shut off the water at the wall. Flush to empty the toilet tank. Unscrew the hose at the toilet, and screw that end into what amounts to a y, or splitter that comes with the bidet. From the splitter, screw one side back into the toilet connection; the other goes to the bidet itself. Turn back on the water at the wall.
(This is for a simple cold-water bidet. If you need heated water or electricity, it can be more complex.)
I mean, but don't you need warm water and/or electricity? I can't see liking a bidet if it's basically just cold tap water shooting up my bum. Not sure that's going to do it for me.
I've always thought that both hot water and electricity would be a minimal barrier to entry for a bidet. And that neither of these exist in a typical toilet closet. Am I fundamentally wrong about this??